[TC] mips: pmag-ba-fb: Convert to the driver model

This is a set of changes to convert the driver to the driver model.  As a
side-effect the driver now supports building as a module.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: James Simmons <jsimmons@infradead.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 56 insertions, 43 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 4e83f01e894e..18c22ba6e656 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1444,8 +1444,8 @@ config FB_PMAG_AA
           used mainly in the MIPS-based DECstation series.
 
 config FB_PMAG_BA
-        bool "PMAG-BA TURBOchannel framebuffer support"
-        depends on (FB = y) && TC
+        tristate "PMAG-BA TURBOchannel framebuffer support"
+        depends on FB && TC
         select FB_CFB_FILLRECT
         select FB_CFB_COPYAREA
         select FB_CFB_IMAGEBLIT
diff --git a/drivers/video/pmag-ba-fb.c b/drivers/video/pmag-ba-fb.c
index f5361cd8ccce..264d37243fad 100644
--- a/drivers/video/pmag-ba-fb.c
+++ b/drivers/video/pmag-ba-fb.c
@@ -15,7 +15,8 @@
  *      Michael Engel <engel@unix-ag.org>,
  *      Karsten Merker <merker@linuxtag.org> and
  *      Harald Koerfgen.
- *      Copyright (c) 2005  Maciej W. Rozycki
+ *      Copyright (c) 2005, 2006  Maciej W. Rozycki
+ *      Copyright (c) 2005  James Simmons
  *
  *      This file is subject to the terms and conditions of the GNU General
  *      Public License.  See the file COPYING in the main directory of this
@@ -28,26 +29,21 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/tc.h>
 #include <linux/types.h>
 
 #include <asm/io.h>
 #include <asm/system.h>
 
-#include <asm/dec/tc.h>
-
 #include <video/pmag-ba-fb.h>
 
 
 struct pmagbafb_par {
-        struct fb_info *next;
         volatile void __iomem *mmio;
         volatile u32 __iomem *dac;
-        int slot;
 };
 
 
-static struct fb_info *root_pmagbafb_dev;
-
 static struct fb_var_screeninfo pmagbafb_defined __initdata = {
         .xres           = 1024,
         .yres           = 864,
@@ -145,24 +141,19 @@ static void __init pmagbafb_erase_cursor(struct fb_info *info)
 }
 
 
-static int __init pmagbafb_init_one(int slot)
+static int __init pmagbafb_probe(struct device *dev)
 {
+        struct tc_dev *tdev = to_tc_dev(dev);
+        resource_size_t start, len;
         struct fb_info *info;
         struct pmagbafb_par *par;
-        unsigned long base_addr;
 
-        info = framebuffer_alloc(sizeof(struct pmagbafb_par), NULL);
+        info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
         if (!info)
                 return -ENOMEM;
 
         par = info->par;
-        par->slot = slot;
-        claim_tc_card(par->slot);
-
-        base_addr = get_tc_base_addr(par->slot);
-
-        par->next = root_pmagbafb_dev;
-        root_pmagbafb_dev = info;
+        dev_set_drvdata(dev, info);
 
         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
                 goto err_alloc;
@@ -172,15 +163,21 @@ static int __init pmagbafb_init_one(int slot)
         info->var = pmagbafb_defined;
         info->flags = FBINFO_DEFAULT;
 
+        /* Request the I/O MEM resource.  */
+        start = tdev->resource.start;
+        len = tdev->resource.end - start + 1;
+        if (!request_mem_region(start, len, dev->bus_id))
+                goto err_cmap;
+
         /* MMIO mapping setup.  */
-        info->fix.mmio_start = base_addr;
+        info->fix.mmio_start = start;
         par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
         if (!par->mmio)
-                goto err_cmap;
+                goto err_resource;
         par->dac = par->mmio + PMAG_BA_BT459;
 
         /* Frame buffer mapping setup.  */
-        info->fix.smem_start = base_addr + PMAG_BA_FBMEM;
+        info->fix.smem_start = start + PMAG_BA_FBMEM;
         info->screen_base = ioremap_nocache(info->fix.smem_start,
                                             info->fix.smem_len);
         if (!info->screen_base)
@@ -192,8 +189,10 @@ static int __init pmagbafb_init_one(int slot)
         if (register_framebuffer(info) < 0)
                 goto err_smem_map;
 
-        pr_info("fb%d: %s frame buffer device in slot %d\n",
-                info->node, info->fix.id, par->slot);
+        get_device(dev);
+
+        pr_info("fb%d: %s frame buffer device at %s\n",
+                info->node, info->fix.id, dev->bus_id);
 
         return 0;
 
@@ -204,54 +203,68 @@ err_smem_map:
 err_mmio_map:
         iounmap(par->mmio);
 
+err_resource:
+        release_mem_region(start, len);
+
 err_cmap:
         fb_dealloc_cmap(&info->cmap);
 
 err_alloc:
-        root_pmagbafb_dev = par->next;
-        release_tc_card(par->slot);
         framebuffer_release(info);
         return -ENXIO;
 }
 
-static void __exit pmagbafb_exit_one(void)
+static int __exit pmagbafb_remove(struct device *dev)
 {
-        struct fb_info *info = root_pmagbafb_dev;
+        struct tc_dev *tdev = to_tc_dev(dev);
+        struct fb_info *info = dev_get_drvdata(dev);
         struct pmagbafb_par *par = info->par;
+        resource_size_t start, len;
 
+        put_device(dev);
         unregister_framebuffer(info);
         iounmap(info->screen_base);
         iounmap(par->mmio);
+        start = tdev->resource.start;
+        len = tdev->resource.end - start + 1;
+        release_mem_region(start, len);
         fb_dealloc_cmap(&info->cmap);
-        root_pmagbafb_dev = par->next;
-        release_tc_card(par->slot);
         framebuffer_release(info);
+        return 0;
 }
 
 
 /*
- * Initialise the framebuffer.
+ * Initialize the framebuffer.
  */
+static const struct tc_device_id pmagbafb_tc_table[] = {
+        { "DEC     ", "PMAG-BA " },
+        { }
+};
+MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
+
+static struct tc_driver pmagbafb_driver = {
+        .id_table       = pmagbafb_tc_table,
+        .driver         = {
+                .name   = "pmagbafb",
+                .bus    = &tc_bus_type,
+                .probe  = pmagbafb_probe,
+                .remove = __exit_p(pmagbafb_remove),
+        },
+};
+
 static int __init pmagbafb_init(void)
 {
-        int count = 0;
-        int slot;
-
+#ifndef MODULE
         if (fb_get_options("pmagbafb", NULL))
                 return -ENXIO;
-
-        while ((slot = search_tc_card("PMAG-BA")) >= 0) {
-                if (pmagbafb_init_one(slot) < 0)
-                        break;
-                count++;
-        }
-        return (count > 0) ? 0 : -ENXIO;
+#endif
+        return tc_register_driver(&pmagbafb_driver);
 }
 
 static void __exit pmagbafb_exit(void)
 {
-        while (root_pmagbafb_dev)
-                pmagbafb_exit_one();
+        tc_unregister_driver(&pmagbafb_driver);
 }